Besides, even if he had been adopted and his name was Tom Corleone, would it have made him a better wartime consigliere?
Hmmm...you raise an interesting point. We've often speculated that Tom could never have taken over the family because he was "Irish" (as well as not being a wartime consigliere). But if Vito had adopted him, would he have been more acceptable to the caporegimes and the other families?